CN110735782B

CN110735782B - Flexible pneumatic driving method of diaphragm pump

Info

Publication number: CN110735782B
Application number: CN201910658409.5A
Authority: CN
Inventors: 张勤
Original assignee: Lu'an Yongzhen Grizzly Electrical And Mechanical Technology Co ltd
Current assignee: Lu'an Yongzhen Grizzly Electrical And Mechanical Technology Co ltd
Priority date: 2019-07-22
Filing date: 2019-07-22
Publication date: 2021-04-16
Anticipated expiration: 2039-07-22
Also published as: CN110735782A

Abstract

The invention provides a flexible pneumatic driving method of a diaphragm pump, which comprises the following steps: firstly, the gas distribution valve is matched with the first one-way valve to alternately distribute gas to a left gas chamber and a right gas chamber in the driving cylinder, the driving piston drives the reciprocating rod to reciprocate, and the driven cylinder is connected and communicated with the pump body and flexibly drives the pump body; then, the exhaust valve and the alternative air distribution mechanism exhaust the compressed air in the left air chamber/the right air chamber and push the air distribution valve core to slide to the left end/the right end of the air distribution valve cavity, so that the air distribution valve alternately distributes air to the left air chamber/the right air chamber; in the above steps, when the volume of the closed air chamber is increased and is converted into a negative pressure state, the suction valve is automatically switched to an open state and the conveying liquid flows into the working chamber; when the volume of the closed air chamber is gradually reduced and the closed air chamber is converted into a positive pressure state, the discharge valve is automatically switched to an open state and the hydraulic pressure in the working chamber is discharged to a specified point through the discharge pipe.

Description

Flexible pneumatic driving method of diaphragm pump

Technical Field

The invention relates to a diaphragm pump, in particular to a flexible pneumatic driving method of the diaphragm pump.

Background

The diaphragm pump has wide application scenes and wide development prospect, changes the volume of a working chamber by means of reciprocating driving of a diaphragm so as to suck and discharge liquid, and the head part of a pneumatic diaphragm pump cylinder mainly separates the conveyed liquid from the working liquid by the diaphragm, when the diaphragm moves to one side of the transmission mechanism, the working chamber in the pump cylinder is under negative pressure to suck liquid, when the diaphragm moves to the other side, the suction liquid is pressurized and discharged, the prior reciprocating fluctuation of the diaphragm is usually directly driven by a mechanical driving mechanism, the driving end of the mechanical driving mechanism is connected with a motor, and the output end of the mechanical driving mechanism is connected with the diaphragm, the driving mode has the defect that the diaphragm is easy to tear and damage due to rigid driving, therefore, the invention designs the diaphragm pump with ingenious structure, simple principle and high transmission efficiency, a flexible pneumatic driving method of a diaphragm pump for flexibly blowing a diaphragm by compressed air.

Disclosure of Invention

In order to solve the defects of the prior art, the invention aims to provide a flexible pneumatic driving method of a diaphragm pump, which has the advantages of ingenious structure, simple principle and high transmission efficiency and can flexibly blast a diaphragm sheet through compressed air.

In order to achieve the technical purpose, the technical scheme adopted by the invention is as follows.

A flexible pneumatic driving method of a diaphragm pump comprises the following steps:

a reciprocating driving stage;

s1: the gas distribution valve is matched with the first one-way valve to alternately distribute gas to a left gas chamber and a right gas chamber in the driving cylinder, the driving piston reciprocates left and right in the first cylinder body, and the driving piston drives the reciprocating rod to synchronously move;

the driving cylinder comprises a cylinder body I which is fixedly arranged on the mounting frame and is provided with openings at two ends, a left opening of the cylinder body I is provided with a left end cover which is in sealing connection and matching with the cylinder body I, a right opening of the cylinder body I is provided with a right end cover which is in sealing connection and matching with the cylinder body I, a driving piston which is in sealing sliding guide and matching with the cylinder body I is arranged in the cylinder body I, a reciprocating rod is coaxially and fixedly arranged on the driving piston, the middle position of the reciprocating rod along the axial direction of the reciprocating rod is fixedly connected with the driving piston, the end part of the reciprocating rod extends to the outside from the left end cover and the right end cover respectively, a left air chamber is formed;

the gas distribution valve comprises a gas distribution valve body which is fixedly arranged on the mounting frame and positioned on one side of the cylinder body, a gas distribution valve cavity which is cylindrical, hollow and axially parallel to the axial direction of the reciprocating rod is arranged in the gas distribution valve body, a main inlet which is communicated with a high-pressure gas source, a left outlet which is connected with the left gas chamber and a right outlet which is connected with the right gas chamber are arranged on the gas distribution valve cavity, the main inlet is positioned in the middle position of the gas distribution valve cavity along the axial direction, the left outlet and the right outlet are positioned on the same side and are oppositely arranged with the main inlet, the left outlet and the right outlet are symmetrically arranged along the axial direction of the main inlet, in order to ensure that the main inlet is communicated with the left outlet or the main inlet is communicated with the right outlet, a gas distribution valve core which forms a sealed sliding guide fit with the gas distribution valve cavity is arranged in the, the diameter of the mandrel is smaller than that of the left core body, the left core body is used for plugging the left outlet, the right core body is used for plugging the right outlet, the maximum distance between the left core body and the left end of the gas distribution valve cavity is equal to the distance between the left outlet and the left end of the gas distribution valve cavity, and the maximum distance between the right core body and the right end of the gas distribution valve cavity is equal to the distance between the right outlet and the right end of the gas distribution valve cavity;

a first one-way valve is arranged between the left outlet and the left air chamber, and a first one-way valve is arranged between the right outlet and the right air chamber;

in the process of distributing gas to the left gas chamber by matching the gas distribution valve with the first one-way valve, when the gas distribution valve core slides to the left end of the gas distribution valve chamber, the right core blocks the right outlet, at the moment, the main inlet is communicated with the left outlet, high-pressure gas enters the input end of the one-way valve body through the input guide pipe, the high-pressure gas pushes the sealing cylinder to slide towards the annular step by overcoming the elastic action of the sealing spring until the sealing cylinder is attached to the annular step, at the moment, the butt joint hole is aligned and communicated with the butt joint groove, the high-pressure gas sequentially passes through the butt joint hole and the butt joint groove to enter the output guide pipe, the output guide pipe outputs the high-pressure gas into the left gas chamber, and the process of distributing gas to the right gas chamber is consistent with the process of;

s2: the reciprocating rod drives the driven pistons in the two driven cylinders to synchronously move, and the driven cylinders are connected and communicated with the pump body and flexibly drive the pump body;

the driven cylinder is provided with two driven cylinders which are respectively connected with the end parts of the reciprocating rods, the driven cylinder comprises a second cylinder body which is fixedly connected with the mounting frame and is provided with openings at two ends, the second cylinder body and the second cylinder body are coaxially arranged, a driven piston which is in sealed sliding guide fit with the second cylinder body is arranged in the second cylinder body, a sealing cover which is in sealed connection fit with the second cylinder body is arranged at an opening at one end of the second cylinder body, which is far away from the first cylinder body, a gas leakage cover which is matched with the second cylinder body is arranged at an opening at one end of the second cylinder body, a closed gas chamber is formed between the driven piston and the sealing cover, a connecting rod which is used for connecting the driven piston and the reciprocating rods is;

the two pump bodies are in one-to-one correspondence with the driven pistons, the pump bodies are used for receiving pneumatic power transmitted by the driven cylinders and sucking and discharging conveying liquid at high pressure in a negative pressure mode, the input end of each pump body is connected with a conveying liquid source, and the output end of each pump body points to a discharge point of the conveying liquid;

s3: the exhaust valve and the alternative air distribution mechanism exhaust the compressed air in the left air chamber/the right air chamber and push the air distribution valve core to slide to the left end/the right end of the air distribution valve cavity, so that the air distribution valve alternately distributes air to the left air chamber/the right air chamber;

(II) liquid suction stage;

s4: when the driven piston slides close to the driving cylinder, the volume of the closed air chamber is increased and is converted into a negative pressure state, the diaphragm is blown towards the pump shell and enables the working chamber to be converted into the negative pressure state, at the moment, the suction valve is automatically switched to an open state, liquid is conveyed under the action of external atmospheric pressure and flows into the working chamber through the liquid inlet pipe, and the suction valve is automatically switched to a closed state;

the pump body comprises a first pump shell which is coaxially and fixedly connected with a sealing cover and is in a round drum shape, a second pump shell which is buckled with the first pump shell and is in a round drum shape is coaxially and fixedly arranged at an opening of the first pump shell, the opening is far away from the sealing cover, a round diaphragm is fixedly arranged between the first pump shell and the second pump shell, a first cavity is formed between the diaphragm and the first pump shell, the first cavity is communicated with a closed air chamber, a second cavity is formed between the diaphragm and the second pump shell, a liquid storage pipe is communicated with the second cavity, the communication position of the second cavity is positioned between the input end and the output end of the liquid storage pipe, the second cavity and the liquid storage pipe jointly form a working chamber with variable volume, a three-way liquid inlet pipe is arranged between the input ends of the two liquid storage pipes, the input end of the inlet pipe is communicated with a conveying liquid source, the output end of, a three-way liquid discharge pipe is arranged between the output ends of the two liquid discharge pipes, the output end of the liquid discharge pipe points to a discharge point, the input end of the liquid discharge pipe is connected with the output end of the liquid storage pipe, a discharge valve used for enabling the conveying liquid to flow from the liquid storage pipe to the liquid discharge pipe in a one-way mode is arranged at the connection position, the suction valve and the discharge valve are both in a closed state in an initial state, the suction valve can be automatically opened when the working chamber is in a negative pressure state, and the discharge valve can be automatically opened when the working chamber is in a positive pressure state;

(III) liquid discharging stage;

s5: when the driven piston slides away from the driving cylinder, the volume of the closed air chamber is gradually reduced and is converted into a positive pressure state, the diaphragm is blown towards the second pump shell and pressurizes liquid sucked in the working chamber, and at the moment, the discharge valve is automatically switched to an open state and the hydraulic pressure in the working chamber is discharged to a designated point through the discharge pipe.

As a further optimization or improvement of the present solution.

The first one-way valve comprises a one-way valve body, a cylindrical hollow inner cavity is arranged in the one-way valve body, an input guide pipe for connecting and connecting the input end of the one-way valve body and the left outlet/right outlet is arranged between the input end of the one-way valve body and the left end cover/right end cover, an output guide pipe for connecting and connecting the output end of the one-way valve body and the left end cover/right end cover is arranged between the output end of the one-way valve body, an annular step is coaxially and fixedly arranged at one end of the inner cavity of the one-way valve body close to the output end of the one-way valve body, a sealing cylinder body which forms a sealed sliding guide fit with the inner cavity of the one-way valve body is coaxially arranged in the inner cavity of the one-way valve body, the sealing, the coaxial annular butt joint groove of seting up and annular butt joint groove is located between annular step and the input of check valve body in the check valve body inner chamber, set up on the outer disc of sealed barrel rather than the butt joint hole of inside switch-on and the blind end that the butt joint hole is close to sealed barrel arranges, the butt joint hole is provided with a plurality ofly and arranges along sealed barrel place circumferencial direction array, and the distance between butt joint hole and the butt joint groove equals the distance between sealed barrel and the annular step.

As a further optimization or improvement of the present solution.

The exhaust valve comprises two exhaust valve bodies and a shared exhaust valve core, the two exhaust valve bodies are arranged in bilateral symmetry and are arranged in one-to-one correspondence with the left end cover and the right end cover, the exhaust valve body positioned on the left side is used for discharging compressed gas of the left gas chamber, the exhaust valve body positioned on the right side is used for discharging compressed gas of the right gas chamber, and the exhaust valve core is used for controlling the on-off of the interior of the exhaust valve core;

the exhaust valve also comprises a fixed plate which is fixedly arranged on the mounting frame and positioned at the other side of the cylinder body, an exhaust valve body is fixedly arranged on the fixed plate, a columnar inner cavity with openings at the left end and the right end is arranged on the exhaust valve body, the axial direction of the inner cavity is parallel to the axial direction of the reciprocating rod, an exhaust inlet communicated with the inner cavity is arranged at one end of the exhaust valve body, which is far away from the fixed plate, an exhaust outlet communicated with the inner cavity is arranged at one end of the exhaust valve body, which is close to the fixed plate, the exhaust outlet is communicated with the outside, the exhaust inlet and the exhaust outlet are arranged oppositely, a first butt joint guide pipe is arranged between the exhaust inlet and a first one-way valve at the same side, the input end of the first butt joint guide pipe is communicated with the inner cavity of the first one-way valve, the communication position is positioned between the, the exhaust valve core is movably inserted in the inner cavity of the exhaust valve body along the axial end position of the exhaust valve core and forms sealed sliding guide fit with the inner cavity, a butt flat groove is formed on the outer circular surface of the exhaust valve core along the axial end position of the exhaust valve core, and the butt flat groove is used for connecting and communicating an exhaust inlet and an exhaust outlet in an initial state;

the exhaust valve comprises an exhaust valve body, an exhaust valve core and an exhaust valve body, wherein the exhaust valve core is coaxially and fixedly sleeved with an external boss along the axial middle position of the exhaust valve core, the external part of the exhaust valve core is movably sleeved with two reset springs, the two reset springs are respectively positioned on one side of the external boss, one end of each reset spring is abutted against the external boss, the other end of each reset spring is abutted against the exhaust valve body, the elastic force of each reset spring is always directed to the external boss by the exhaust valve body, and the elastic forces of the two reset springs are mutually.

As a further optimization or improvement of the present solution.

External boss be close to the fixed rectangular connecting plate that is provided with length direction and is on a parallel with reciprocating rod axial one side of cylinder body, the middle part position and external boss fixed connection of length direction are followed to the connecting plate, and the connecting plate is provided with towards the trigger plate that cylinder body one extended to along its length direction's one end, and the distance between two trigger plates is less than the distance of initiative piston side-to-side movement, the fixed link that is provided with on the tip position of reciprocating rod, the fixed intermediate position that is located two trigger plates that is provided with under trigger lug and the initial condition on the link.

As a further optimization or improvement of the present solution.

The alternate valve actuating mechanism is provided with two, wherein one alternate valve actuating mechanism is arranged between the first butt joint guide pipe positioned on the left side and the right end of the valve actuating chamber, the other alternate matching mechanism is arranged between the first butt joint guide pipe positioned on the right side and the left end of the valve actuating chamber, the alternate valve actuating mechanism comprises a second one-way valve, a second butt joint guide pipe and an exhaust pipe provided with a plurality of exhaust holes, the output end of the second one-way valve is communicated with the left end/right end of the exhaust valve chamber, the input end of the second butt-joint guide pipe is connected and communicated with the butt-joint guide pipe, the output end of the second butt-joint guide pipe is connected and communicated with the input end of the second one-way valve, the structure, the size and the shape of the second one-way valve are completely consistent with those of the first one-way valve, the input end of the outer discharge pipe is connected and communicated with the inner cavity of the second one-way valve, and the connection position is located between the annular step in the second one-way valve and the sealing cylinder in the initial state.

Compared with the prior art, the pneumatic piston cylinder has the advantages that the structure is ingenious, the principle is simple, the transmission efficiency is high, the pneumatic piston cylinder is directly driven to do reciprocating motion through high-pressure gas, the diaphragm sheets are indirectly driven to be blown through reciprocating motion compressed air, the impact on the diaphragm sheets is reduced, the service life of the diaphragm sheets is prolonged, meanwhile, the two diaphragm sheets are driven to alternately blow through reciprocating motion, and the pneumatic transmission efficiency is improved.

Drawings

Fig. 1 is a schematic view of the overall structure of the present invention.

Fig. 2 is a schematic view of the overall structure of the present invention.

Fig. 3 is a schematic structural diagram of the working state of the present invention.

Fig. 4 is a schematic structural diagram of the working state of the present invention.

Fig. 5 is a schematic structural view of the pneumatic reciprocation device.

Fig. 6 is a schematic structural view of the cylinder.

Fig. 7 is a connection diagram of the master cylinder and the slave cylinder.

FIG. 8 is a cross-sectional view of the master cylinder and slave cylinder.

FIG. 9 is a connection diagram of the master cylinder with the air distribution valve and the first check valve.

Fig. 10 is a connection diagram of the gas distribution valve and the first check valve.

Fig. 11 is a schematic structural diagram of the gas distribution valve.

Fig. 12 is a cross-sectional view of a gas distribution valve.

Fig. 13 is a cross-sectional view of a gas distribution valve.

Fig. 14 is a schematic structural view of the first check valve.

Fig. 15 is a cross-sectional view of the first one-way valve.

Fig. 16 is a cross-sectional view of the first one-way valve.

Fig. 17 is a partial structural view of the first check valve.

Fig. 18 is a view showing the pump body and the slave cylinder in cooperation.

Fig. 19 is a partial structural view of the pump body.

Fig. 20 is a partial cross-sectional view of the pump body.

Fig. 21 is a schematic structural view of a diaphragm of the pump body.

FIG. 22 is a connection diagram of an exhaust valve and alternate valve train.

Fig. 23 is a connection diagram of the discharge valve and the first check valve.

Fig. 24 is a partial structural view of the exhaust valve.

Fig. 25 is a partial structural view of the exhaust valve.

Fig. 26 is a partial structure view of the exhaust valve.

FIG. 27 is a diagram of the exhaust valve in conjunction with the master cylinder.

Fig. 28 is a schematic structural view showing a closed state of the exhaust valve.

Fig. 29 is a schematic structural view of a valve train.

FIG. 30 is a connection diagram of an alternate valve train and valve.

FIG. 31 is a connection diagram of an alternate valve train and valve.

Detailed Description

a reciprocating driving stage;

s1: the gas distribution valve 130 and the first one-way valve 140 cooperate to alternately distribute gas to the left gas chamber 124 and the right gas chamber 125 in the driving cylinder 120a, the driving piston 122 reciprocates left and right in the cylinder body one 121, and the driving piston 122 drives the reciprocating rod 123 to move synchronously;

the driving cylinder 120a comprises a cylinder body I121 which is fixedly installed on the mounting frame 110 and is provided with openings at two ends, a left end cover 121a which is in sealing connection and matching with the cylinder body I121 is arranged at the left opening of the cylinder body I121, a right end cover 121b which is in sealing connection and matching with the cylinder body I121 is arranged at the right opening of the cylinder body I, a driving piston 122 which is in sealing sliding guide and matching with the cylinder body I121 is arranged in the cylinder body I121, a reciprocating rod 123 is coaxially and fixedly arranged on the driving piston 122, the middle position of the reciprocating rod 123 along the axial direction of the reciprocating rod is fixedly connected with the driving piston 122, the end part of the reciprocating rod 123 extends to the outside from the left end cover 121a and the right end cover 121b respectively, a left air chamber 124 is formed between the driving piston;

the air distribution valve 130 comprises an air distribution valve body 131 which is fixedly arranged on the mounting frame 110 and is positioned on one side of the cylinder body 121, a cylindrical hollow air distribution valve cavity 132 which is axially parallel to the axial direction of the reciprocating rod 123 is arranged in the air distribution valve body 131, a main inlet 133 which is communicated with a high-pressure air source, a left outlet 134 which is connected with the left air chamber 124 and a right outlet 135 which is connected with the right air chamber 124 are arranged on the air distribution valve cavity 132, the main inlet 133 is positioned in the middle position of the air distribution valve cavity 132 along the axial direction, the left outlet 134 and the right outlet 135 are positioned on the same side and are arranged opposite to the main inlet 133, the left outlet 134 and the right outlet 135 are symmetrically arranged along the axial direction of the main inlet 133, in order to ensure that the main inlet 133 is communicated with the left outlet 134 or the main inlet 133 is communicated with the right outlet 135, an air distribution valve core 136 which is in sealing sliding guide fit with the air, The mandrel is coaxially and fixedly connected with the right core body and the mandrel, the diameter of the mandrel is smaller than that of the left core body, the left core body is used for plugging the left outlet 134, the right core body is used for plugging the right outlet 135, the maximum distance between the left core body and the left end of the gas distribution valve cavity 132 is equal to the distance between the left outlet 134 and the left end of the gas distribution valve cavity 132, and the maximum distance between the right core body and the right end of the gas distribution valve cavity 132 is equal to the distance between the right outlet 135 and the right end of the gas distribution valve cavity 132;

a first check valve 140 is arranged between the left outlet 134 and the left air chamber 124, and a first check valve 140 is arranged between the right outlet 135 and the right air chamber 125;

in the process of distributing gas to the left gas chamber 124 by the mutual cooperation of the gas distribution valve 130 and the first one-way valve 140, when the gas distribution valve core 136 slides to the left end of the gas distribution valve cavity 132, the right core blocks the right outlet 135, at this time, the main inlet 133 is communicated with the left outlet 134, high-pressure gas enters the input end of the one-way valve body 141 through the input conduit 142, the high-pressure gas pushes the sealing cylinder 145 to slide towards the annular step 144 against the elastic action of the sealing spring 146 until the sealing cylinder 145 is attached to the annular step 144, at this time, the butt joint hole 147 is communicated with the butt joint groove 148 in an aligned manner, the high-pressure gas sequentially passes through the butt joint hole 147 and the butt joint groove 148 to enter the output conduit 143, the output conduit 143 outputs the high-pressure gas to the left gas chamber 124, and the process of distributing gas to the right gas chamber 125 by the gas distribution valve 130 is;

s2: the reciprocating rod 123 drives the driven pistons 127 in the two driven cylinders 120b to move synchronously, and the driven cylinders 120b are connected with the pump body 200 and flexibly drive the pump body 200;

the driven cylinder 120b is provided with two cylinders and is respectively connected with the end part positions of the reciprocating rod 123, the driven cylinder 120b comprises a second cylinder 126 which is fixedly connected with the mounting frame 110 and is provided with openings at two ends, the second cylinder 126 and the first cylinder 121 are coaxially arranged, a driven piston 127 which forms sealed sliding guide fit with the second cylinder 126 is arranged in the second cylinder 126, a sealing cover 126a which forms sealed connection fit with the second cylinder 126 is arranged at an opening at one end of the second cylinder 126, which is far away from the first cylinder 121, a gas leakage cover 126b which is matched with the second cylinder is arranged at an opening at one end of the second cylinder 126, a sealed gas chamber 128 is formed between the driven piston 127 and the sealing cover 126b, a connecting rod which is used for connecting the two is coaxially and fixedly arranged between the driven piston 127 and the reciprocating rod 123, the connecting rod movably penetrates through the gas leakage;

the two pump bodies 200 are arranged and correspond to the driven pistons 127 one by one, the pump bodies 200 are used for receiving the pneumatic power transmitted by the driven cylinders 120b and performing negative pressure suction and high pressure discharge on the conveying liquid, the input end of each pump body 200 is connected with a conveying liquid source, and the output end of each pump body points to a discharge point of the conveying liquid;

s3: the exhaust valve 300 and the alternative air distribution mechanism 400 exhaust the compressed air in the left air chamber 124/the right air chamber 125 and push the air distribution valve core 136 to slide to the left end/the right end of the air distribution valve cavity 132, so that the air distribution valve 130 distributes air to the left air chamber 124/the right air chamber 125 alternatively;

(II) liquid suction stage;

s4: when the driven piston 127 slides close to the driving cylinder 120a, the volume of the sealed air chamber 128 increases and is changed into a negative pressure state, the diaphragm 203 will be blown towards the pump shell 201 and make the working chamber changed into the negative pressure state, at this time, the suction valve 208 automatically switches to an open state and the conveying liquid will flow into the working chamber through the liquid inlet pipe 207a under the action of the external atmospheric pressure, and the suction valve 208 automatically switches to a closed state;

the pump body 200 comprises a first pump shell 201 which is coaxially and fixedly connected with a sealing cover 126a and is in a round drum shape, a second pump shell 202 which is buckled with the first pump shell 201 and is in a round drum shape is coaxially and fixedly arranged at an opening of the first pump shell 201, which is far away from the sealing cover 126a, a circular diaphragm 203 is fixedly arranged between the first pump shell 201 and the second pump shell 202, a first cavity 204 is formed between the diaphragm 203 and the first pump shell 201, the first cavity 204 is communicated with a closed air chamber 128, a second cavity 205 is formed between the diaphragm 203 and the second pump shell 202, a liquid storage pipe 206 is communicated with the second cavity 205, the communication position is positioned between the input end and the output end of the liquid storage pipe 206, the second cavity 205 and the liquid storage pipe 206 jointly form a working chamber with variable volume, a three-way liquid inlet pipe 207a is arranged between the input ends of the two liquid storage pipes 206, the input end of the liquid inlet pipe 207a is communicated with a conveying liquid source, the output end is connected with A suction valve 208 in the liquid storage pipe 206, a three-way liquid discharge pipe 207b is arranged between the output ends of the two liquid storage pipes 206, the output end of the liquid discharge pipe 207b points to a discharge point, the input end is connected with the output end of the liquid storage pipe 206, a discharge valve 209 for enabling the conveying liquid to flow from the liquid storage pipe 206 to the liquid discharge pipe 207b in a one-way mode is arranged at the connection position, the suction valve 208 and the discharge valve 209 are both in a closed state in an initial state, the suction valve 208 can be automatically opened when the working chamber is in a negative pressure state, and the discharge valve 209 can be automatically opened when the working chamber is in a positive pressure state;

(III) liquid discharging stage;

s5: when the slave piston 127 slides away from the master cylinder 120a, the volume of the closed air chamber 128 gradually decreases and changes to a positive pressure state, the diaphragm 203 will be blown toward the second pump housing 202 and pressurize the liquid sucked into the working chamber, and at this time, the discharge valve 209 automatically switches to an open state and discharges the liquid pressure in the working chamber to a specified point through the discharge pipe 207 b.

A pneumatic reciprocating driving diaphragm pump comprises a pneumatic reciprocating device 100, a pump body 200, an exhaust valve 300 and an alternative air distribution mechanism 400, wherein the pneumatic reciprocating device 100 comprises a mounting frame 110, an air cylinder 120 and an air distribution valve 130 which are fixedly installed on the mounting frame 110, the air cylinder 120 comprises a driving air cylinder 120a and a driven air cylinder 120b, the driving air cylinder 120a comprises a first cylinder body 121 which is fixedly installed on the mounting frame 110 and is provided with openings at two ends, a left end cover 121a matched with the first cylinder body 121 in a sealing connection mode is arranged at the left opening of the first cylinder body 121, a right end cover 121b matched with the first cylinder body in a sealing connection mode is arranged at the right opening of the first cylinder body, a driving piston 122 matched with the first cylinder body in a sealing sliding guide mode is arranged in the first cylinder body 121, a reciprocating rod 123 is coaxially and fixedly connected with the driving piston 122 along the axial middle position of the reciprocating rod, The right end cap 121b extends to the outside, a left air chamber 124 is formed between the driving piston 122 and the left end cap 121a, and a right air chamber 125 is formed between the driving piston 122 and the right end cap 121 b.

Specifically, the two driven cylinders 120b are provided and are respectively connected with the end positions of the reciprocating rod 123, the driven cylinder 120b includes a second cylinder body 126 fixedly connected with the mounting frame 110 and having openings at two ends, the second cylinder body 126 and the first cylinder body 121 are coaxially arranged, a driven piston 127 forming a sealed sliding guide fit with the second cylinder body 126 is provided in the second cylinder body 126, a sealing cover 126a forming a sealed connection fit with the second cylinder body 126 is provided at an opening at one end of the second cylinder body 126 away from the first cylinder body 121, a gas leakage cover 126b matching with the second cylinder body 126 is provided at an opening at one end of the second cylinder body 126 close to the first cylinder body 121, a sealed gas chamber 128 is formed between the driven piston 127 and the sealing cover 126b, a connecting rod connecting the driven piston 127 and the reciprocating rod 123 is coaxially and fixedly provided, the connecting rod movably penetrates through the gas leakage cover 126 b.

More specifically, two pump bodies 200 are provided and correspond to the slave pistons 127 one by one, the pump bodies 200 are configured to receive the pneumatic power transmitted by the slave cylinders 120b and perform negative pressure suction and high pressure discharge on the delivery liquid, the input end of the pump bodies 200 is connected to the delivery liquid source, the output end of the pump bodies points to the discharge point of the delivery liquid, the exhaust valve 300 is configured to discharge the gas inside the compressed left air chamber 124/right air chamber, and the alternate gas distribution mechanism 400 is configured to receive part of the gas discharged by the exhaust valve 30 and is automatically triggered to make the gas distribution valve 130 distribute the gas alternately to the left air chamber 124 and the right air chamber 125.

During the process of pumping liquid, when the gas distribution valve 130 distributes gas to the left gas chamber 124, the driving piston 122 moves to the right and drives the reciprocating rod 123 to move synchronously, the compressed gas in the right gas chamber 125 is discharged partially through the gas discharge valve 300, then the gas discharge valve 300 discharges the compressed gas to the alternative gas distribution mechanism 400, the alternative gas distribution mechanism 400 switches the gas distribution valve 130 to distribute gas to the right gas chamber 125 when the driving piston 122 moves to the right end, at this time, the driving piston 122 moves to the left and drives the reciprocating rod 123 to move synchronously, the compressed gas in the left gas chamber 124 is discharged partially through the gas discharge valve 300, then the gas discharge valve 300 discharges the compressed gas to the alternative gas distribution mechanism 400, the alternative gas distribution mechanism 400 switches the gas distribution valve 130 to distribute gas to the left gas chamber 124 when the driving piston 122 moves to the left end, and the reciprocating motion is performed in such a way that the reciprocating rod 123 drives the driven piston 127 to reciprocate along the cylinder 126 and realize the reciprocating motion of the pump body 200 In this process, when the airtight gas chamber 128 increases, the pump main body 200 sucks in the negative pressure of the transport liquid, and when the airtight gas chamber 128 decreases, the pump main body 200 discharges the sucked transport liquid under pressure.

The pump body 200 comprises a first pump shell 201 which is coaxially and fixedly connected with a sealing cover 126a and is in a circular drum shape, a second pump shell 202 which is buckled with the first pump shell 201 and is in a circular drum shape is coaxially and fixedly arranged at an opening of the first pump shell 201, which is far away from the sealing cover 126a, a circular diaphragm 203 is fixedly arranged between the first pump shell 201 and the second pump shell 202, a first cavity 204 is formed between the diaphragm 203 and the first pump shell 201, the first cavity 204 is communicated with a closed air chamber 128, a second cavity 205 is formed between the diaphragm 203 and the second pump shell 202, a liquid storage pipe 206 is communicated with the second cavity 205, the communication position is positioned between the input end and the output end of the liquid storage pipe 206, the second cavity 205 and the liquid storage pipe 206 jointly form a working chamber with variable volume, in order to facilitate the suction of liquid from the left liquid storage pipe 206 and the right liquid storage pipe 206, a three-way liquid inlet, The output end is connected with the input end of the liquid storage pipe 206, the connection position is provided with a suction valve 208 which is used for enabling the conveying liquid to flow into the liquid storage pipe 206 from the liquid inlet pipe 207a in a one-way mode, a three-way liquid discharge pipe 207b is arranged between the output ends of the two liquid storage pipes 206, the output end of the liquid discharge pipe 207b points to a discharge point, the input end is connected with the output end of the liquid storage pipe 206, the connection position is provided with a discharge valve 209 which is used for enabling the conveying liquid to flow into the liquid discharge pipe 207b from the liquid storage pipe 206 in a one-way mode, the suction valve 208 and the discharge valve 209 are both in a closed state in an initial state, the suction valve 208 can be automatically opened when the working chamber is in a negative pressure state, and the.

During operation of the pump body 200, as the slave piston 127 slides adjacent the master cylinder 120a, the closing air chamber 128 increases in volume and changes to a negative pressure state, the diaphragm 203 will be pushed toward the pump housing one 201 and the working chamber changes to a negative pressure state, at this time, the suction valve 208 is automatically switched to the open state and the transport liquid flows into the working chamber through the liquid inlet pipe 207a by the external atmospheric pressure, when the pressure difference between the outside and the working chamber is gradually reduced, the suction valve 208 is automatically switched to the closed state, when the slave piston 127 slides away from the master cylinder 120a, the volume of the closed air chamber 128 gradually decreases and changes to a positive pressure state, the diaphragm 203 will be blown toward the second pump housing 202 and pressurize the liquid sucked into the working chamber, and at this time, the discharge valve 209 automatically switches to an open state and discharges the liquid pressure in the working chamber to a specified point through the discharge pipe 207 b.

In order to distribute air to the left air chamber 124/the right air chamber 125, the air distribution valve 130 includes an air distribution valve body 131 fixedly installed on the mounting frame 110 and located on one side of the cylinder body 121, an air distribution valve cavity 132 which is cylindrical and hollow and axially parallel to the axial direction of the reciprocating rod 123 is arranged in the air distribution valve body 131, a main inlet 133 connected and communicated with a high-pressure air source, a left outlet 134 connected with the left air chamber 124, and a right outlet 135 connected with the right air chamber 124 are formed in the air distribution valve cavity 132, the main inlet 133 is located at the middle position of the air distribution valve cavity 132 along the axial direction, the left outlet 134 and the right outlet 135 are located on the same side and are arranged opposite to the main inlet 133, the left outlet 134 and the right outlet 135 are symmetrically arranged along the axial direction of the main inlet 133, in order to enable the main inlet 133 to be connected and communicated with the left outlet 134 or the main inlet 133 to be connected and communicated with the right outlet, the gas distribution valve core 136 comprises a left core body and a right core body which are in an equal-size column shape, and a mandrel which is coaxially and fixedly connected with the left core body and the right core body, wherein the diameter of the mandrel is smaller than that of the left core body, the left core body is used for plugging the left outlet 134, the right core body is used for plugging the right outlet 135, the maximum distance between the left core body and the left end of the gas distribution valve cavity 132 is equal to the distance between the left outlet 134 and the left end of the gas distribution valve cavity 132, the maximum distance between the right core body and the right end of the gas distribution valve cavity 132 is equal to the distance between the right outlet 135 and the right end of the gas distribution valve cavity 132, the gas distribution valve core 136 slides to the left end of the gas distribution valve cavity 132 to enable the main inlet 133 to be communicated with the left outlet.

Specifically, in order to enable the high-pressure gas discharged from the left outlet 134 to be discharged into the left air chamber 124 or the high-pressure gas discharged from the right outlet 135 to be discharged into the right air chamber 125, a first check valve 140 is arranged between the left outlet 134 and the left air chamber 124, a first check valve 140 is arranged between the right outlet 135 and the right air chamber 125, the first check valve 140 includes a check valve body 141, a cylindrical hollow cavity is arranged in the check valve body 141, an input conduit 142 for connecting and connecting the input end of the check valve body 141 and the left outlet 134/right outlet 135 is arranged between the input end of the check valve body 141 and the left end cover 121 a/right end cover 121b, an output conduit 143 for connecting and connecting the output end of the check valve body 141 is arranged between the output end and the left end cover 121 a/right end cover 121b, in order to enable the inside of the check valve body 141 to be unidirectionally conducted from the input end to, a sealing cylinder 145 which forms a sealing sliding guiding fit with the one-way valve body 141 is coaxially arranged in the inner cavity of the one-way valve body 141, the sealing cylinder 145 is arranged close to an opening at one end of the output end of the one-way valve body 141 and close to one end of the input end of the one-way valve body 141, a sealing spring 146 is arranged in the sealing cylinder 145, one end of the sealing spring 146 is abutted against the closed end of the sealing cylinder 145, the other end of the sealing spring is abutted against the annular step 144, the elastic force of the sealing spring 146 always points to the closed end of the sealing cylinder 145 from the annular step 144, an annular butt joint groove 148 is coaxially arranged in the inner cavity of the one-way valve body 141, the annular butt joint groove 148 is positioned between the annular step 144 and the input end of the one-way valve body 141, a butt joint hole 147 communicated with the inner part of the sealing cylinder, the distance between the abutting hole 147 and the abutting groove 138 is equal to the distance between the sealing cylinder 145 and the annular step 144, and the sealing cylinder 145 is attached to the annular step 144 by overcoming the elastic force of the sealing spring 146, so that the abutting hole 147 is communicated with the abutting groove 148, and the interior of the check valve body 141 is communicated in a one-way mode.

In the process of distributing gas to the left gas chamber 124 by the mutual cooperation of the gas distribution valve 130 and the first one-way valve 140, when the gas distribution valve core 136 slides to the left end of the gas distribution valve cavity 132, the right core blocks the right outlet 135, at this time, the main inlet 133 is communicated with the left outlet 134, high-pressure gas enters the input end of the one-way valve body 141 through the input conduit 142, the high-pressure gas pushes the sealing cylinder 145 to slide towards the annular step 144 against the elastic force of the sealing spring 146 until the sealing cylinder 145 is attached to the annular step 144, at this time, the butt joint hole 147 is communicated with the butt joint groove 148 in an aligned manner, the high-pressure gas sequentially passes through the butt joint hole 147 and the butt joint groove 148 to enter the output conduit 143, the output conduit 143 outputs the high-pressure gas to the left gas chamber 124, and the process of distributing gas to the right gas chamber 125 by the gas distribution valve 130 is.

If the compressed gas in the left/

right air chambers

124, 125 is not discharged in time, how the high-pressure gas pushes the driving piston 122 to slide along the cylinder block one 121, for this reason, the exhaust valve 300 includes two exhaust valve bodies 302 and a common exhaust valve core 304, the two exhaust valve bodies 302 are arranged in bilateral symmetry and are arranged in one-to-one correspondence with the left end cover 121a and the right end cover 121b, the exhaust valve body 302 on the left side is used for discharging the compressed gas in the left air chamber 124, the exhaust valve body 302 on the right side is used for discharging the compressed gas in the right air chamber 125, and the exhaust valve core 304 is used for controlling the on-off of the inside of the exhaust valve core 302.

Specifically, the exhaust valve 300 further includes a fixing plate 301 fixedly mounted on the mounting frame 110 and located on the other side of the cylinder block one 121, and an exhaust valve body 302 is fixedly mounted on the fixing plate 301, the exhaust valve body 302 is provided with a cylindrical inner cavity with left and right openings arranged, the axial direction of the inner cavity is parallel to the axial direction of the reciprocating rod 123, one end of the exhaust valve body 302, away from the fixing plate 301, is provided with an exhaust inlet 303a communicated with the inner cavity thereof, one end of the exhaust valve body 302, close to the fixing plate, is provided with an exhaust outlet 303b communicated with the inner cavity thereof, the exhaust inlet 303a and the exhaust outlet 303b are arranged opposite to each other, in order to facilitate discharging the compressed gas in the left air chamber 124/the right air chamber 125 into the exhaust valve body 302, a docking guide tube one 309 is arranged between the exhaust inlet 303a and the first one-way valve 140 on the same side, an input end of the docking guide tube one 309 is communicated with the The output end of the first butt joint conduit 309 is connected and communicated with the exhaust inlet 303a, in order to control the connection and disconnection between the exhaust inlet 303a and the exhaust outlet 303b, the exhaust valve core 304 is arranged into a rod-shaped structure which is axially parallel to the axial direction of the reciprocating rod 123, the end position of the exhaust valve core 304 along the axial direction is movably inserted into the inner cavity of the exhaust valve body 302 and forms a sealed sliding guide fit with the inner cavity, the outer circular surface of the end position of the exhaust valve core 304 along the axial direction is provided with a butt joint flat groove 304a, and the butt joint flat groove 304a is used for connecting and communicating the exhaust inlet 303a and the exhaust outlet 303b in an initial state.

More specifically, the exhaust valve core 304 is coaxially and fixedly sleeved with an external boss 304b along the axial middle position thereof, a return spring 304c is movably sleeved outside the exhaust valve core 304, the two return springs 304c are respectively positioned at one side of the external boss 304b, one end of the return spring 304c is abutted against the external boss 304b, the other end of the return spring is abutted against the exhaust valve body 302, the elastic force of the return spring 304c is always directed to the external boss 304b from the exhaust valve body 302, the elastic forces of the two return springs 304c are balanced in the initial state, the external boss 304b is positioned between the two exhaust valve bodies 302, the exhaust inlet 303a and the exhaust outlet 303b are communicated by the abutting flat groove 304a, the exhaust valve body 302 is communicated, the exhaust valve core 304 slides leftwards/rightwards by overcoming the elastic force of the return spring 304c, and the abutting flat groove 304a and the exhaust inlet 303a are communicated, The exhaust outlet 303b is staggered, and the exhaust valve body 302 is opened.

The exhaust valve 300 firstly discharges a part of the compressed gas in the left air chamber 124/the right air chamber 125, then switches to the closed state and discharges the rest of the gas into the alternative valve actuating mechanism 400 for the automatic triggering of the alternative valve actuating mechanism 400, therefore, the exhaust valve 300 needs to be switched to the closed state before the active piston 122 slides to the left end point/the right end point of the cylinder body 121, for this purpose, a rectangular connecting plate 305a with the length direction parallel to the axial direction of the reciprocating rod 123 is fixedly arranged on one side surface of the cylinder body 121 close to the outer boss 304b, the middle position of the connecting plate 305a along the length direction is fixedly connected with the outer boss 304b, one end of the connecting plate 305b along the length direction is provided with a triggering plate 305b extending towards the cylinder body 121, and the distance between the two triggering plates 305b is smaller than the distance of the left-right movement of the active piston 122, a linkage frame 307 is fixedly arranged at the end position of the reciprocating rod 123, a trigger bump 308 is fixedly arranged on the linkage frame 307, the trigger bump 308 is positioned at the middle position of the two trigger plates 305b in the initial state, the trigger plate 305b is pushed to move leftwards/rightwards by the trigger bump 308, the exhaust valve core 304 is driven to slide leftwards/rightwards, and therefore the exhaust valve 300 is switched to the closed state.

As a more optimized scheme of the present invention, in order to avoid the trigger bump 308 from causing collision damage to the trigger plate 305b, a buffer assembly is disposed on the trigger plate 305b, the buffer assembly includes a buffer guide rod 306 penetrating through the trigger plate 305b and parallel to the axial direction of the reciprocating rod 123, the buffer guide rod 306 and the trigger plate 305b form a sliding guiding fit along the axial direction parallel to the reciprocating rod 123, in order to avoid the buffer guide rod 306 and the trigger plate 305b from falling off, a bolt 306a forming a threaded connection fit with the buffer guide rod 306 is coaxially disposed at one end of the buffer guide rod 306 away from each other, the diameter of the bolt 306a is greater than that of the buffer guide rod 306, a circular truncated cone 306b is coaxially disposed at one end of the buffer guide rod 306 close to each other, the diameter of the circular truncated cone 306b is greater than that of the buffer guide rod 306, a buffer spring 306c is movably sleeved, The other end of the trigger bar is abutted against the trigger plate 305b, the elastic force of the buffer spring 306c is always directed to the circular truncated cone 306b from the trigger plate 305b, the trigger bump 308 firstly abuts against the circular truncated cone 306 against the buffer spring 306c, and then the trigger plate 305b is driven to slide left and right, so that the damage of the trigger plate 305b caused by the direct collision of the trigger bump 308 and the trigger plate 305b is avoided.

During operation, the exhaust valve 300 exhausts the left air chamber 124, the driving piston 122 slides to the left and drives the reciprocating rod 123 to move synchronously, air in the left air chamber 124 is compressed and enters the first docking conduit 309 connected with the left first check valve 140, then the compressed air is exhausted to the air through the exhaust inlet 303a, the communication flat groove 304a and the exhaust outlet 303b in sequence, before the driving piston 122 moves to the left end point, the trigger lug 308 collides with the circular truncated cone 306b by overcoming the elastic force of the buffer spring 306c and drives the trigger plate 305b to move to the left, the trigger plate 305b drives the exhaust valve core 304 to move to the left synchronously and stagger the communication flat groove 304a with the exhaust inlet 303a and the exhaust outlet 303b, the exhaust valve 300 is automatically switched to the closed state, and then the air distributed by the compression of the left air chamber 124 enters the alternating mechanism 400 during the movement of the driving piston 122 to the left end point, the alternative air distribution mechanism 400 automatically triggers to switch the air distribution valve 130 to distribute air to the left air chamber 124; the process of exhausting the right air chamber 125 is the same as the process of exhausting the left air chamber 124, and the description thereof is omitted.

In order to control the gas distribution valve core 136 to slide to the end position of the gas distribution valve cavity 132 leftwards/rightwards, two alternative gas distribution mechanisms 400 are provided, wherein one alternative gas distribution mechanism 400 is arranged between a first docking guide pipe 309 positioned on the left side and the right end of the gas distribution valve cavity 132, the other alternative matching mechanism 400 is arranged between a first docking guide pipe 309 positioned on the right side and the left end of the gas distribution valve cavity 132, the alternative gas distribution mechanism 400 comprises a second one-way valve 401, a second docking guide pipe 402 and an exhaust pipe 403 provided with a plurality of exhaust holes 404, the output end of the second one-way valve 401 is communicated with the left end/right end of the exhaust valve cavity 132, the input end of the second docking guide pipe 402 is communicated with the first docking guide pipe 309, the output end of the second docking guide pipe 402 is communicated with the input end of the second one-way valve 401, and the structure, size and shape, the input end of the external discharge pipe 403 is connected and communicated with the inner cavity of the second one-way valve 401, and the communicated position is positioned between the annular step 144 in the second one-way valve and the sealing cylinder 145 in the initial state.

In the operation of the alternative valve distribution mechanism 400, when the gas distribution valve core 136 is located at the left end of the gas distribution valve cavity 132, the gas distribution valve 130 distributes gas to the left gas chamber inlet 124, the right gas chamber 125 is compressed and the compressed gas is firstly discharged from the gas discharge valve 300, when the gas discharge valve 300 is switched to the closed state, the compressed gas is discharged to the first docking conduit 402, the second one-way valve 401 located at the left side is automatically conducted by the gas pressure and the compressed gas enters the left end of the gas distribution valve cavity 132, the gas distribution valve core 136 is pushed to slide rightwards along the gas distribution valve cavity 132, when the gas distribution valve core 136 slides to the right end of the gas distribution valve cavity 132, the gas distribution valve 130 distributes gas to the right gas chamber 125, the left gas chamber 124 is compressed and the compressed gas is firstly discharged outwards from the gas discharge valve 300, when the gas discharge valve 300 is switched to the closed state, the compressed gas is discharged to the first docking conduit 402, and the second one-way valve 401 located at the right side is automatically conducted by the gas pressure and the compressed gas The right end of the air distribution valve cavity 132 pushes the air distribution valve core 136 to slide leftwards along the air distribution valve cavity 132, when the air distribution valve core 136 slides to the left end of the air distribution valve cavity 132, the air distribution valve 300 distributes air to the left air chamber 124, and the operation is repeated in such a way, so that the air distribution valve 130 distributes air to the left air chamber 124 and the right air chamber 125 alternately.

Claims

1. A flexible pneumatic driving method of a diaphragm pump comprises the following steps:

a reciprocating driving stage;

when the gas distribution valve core slides to the left end of the gas distribution valve cavity, the right core body plugs the right outlet, at the moment, the main inlet is communicated with the left outlet, high-pressure gas enters the input end of the one-way valve body through the input guide pipe, the high-pressure gas pushes the sealing cylinder body to slide towards the annular step by overcoming the elastic action of the sealing spring until the sealing cylinder body is attached to the annular step, at the moment, the butt joint hole is aligned and communicated with the butt joint groove, the high-pressure gas sequentially passes through the butt joint hole and the butt joint groove to enter the output guide pipe, the output guide pipe outputs the high-pressure gas into the left gas chamber, and the gas distribution process of the gas distribution valve to the right gas chamber is consistent with the gas distribution process to the left gas chamber;

(II) liquid suction stage;

the pump body comprises a first pump shell which is coaxially and fixedly connected with a sealing cover and is in a round drum shape, a second pump shell which is buckled with the first pump shell and is in a round drum shape is coaxially and fixedly arranged at an opening of the first pump shell, the first pump shell is fixedly arranged between the first pump shell and the second pump shell, a first cavity is formed between the first diaphragm and the first pump shell, the first cavity is communicated with a closed air chamber, a second cavity is formed between the second diaphragm and the second pump shell, a liquid storage pipe is communicated with the second cavity, the communication position of the second cavity is positioned between the input end and the output end of the liquid storage pipe, the second cavity and the liquid storage pipe jointly form a working chamber with variable volume, a three-way liquid inlet pipe is arranged between the input ends of the two liquid storage pipes, the input end of the inlet pipe is communicated with a conveying liquid source, the output end of the inlet pipe is connected with, a three-way liquid discharge pipe is arranged between the output ends of the two liquid storage pipes, the output end of the liquid discharge pipe points to a discharge point, the input end of the liquid discharge pipe is connected with the output end of the liquid storage pipe, a discharge valve used for enabling conveying liquid to flow into the liquid discharge pipe from the liquid storage pipe in a one-way mode is arranged at the connection position, the suction valve and the discharge valve are both in a closed state in an initial state, the suction valve can be automatically opened when the working chamber is in a negative pressure state, and the discharge valve can be automatically opened when the working chamber is in a positive pressure state;

(III) liquid discharging stage;

2. The flexible pneumatic driving method of a diaphragm pump according to claim 1, wherein the air distribution valve comprises an air distribution valve body fixedly mounted on the mounting frame and located on one side of the cylinder body, an air distribution valve cavity which is cylindrical and hollow and axially parallel to the axial direction of the reciprocating rod is arranged in the air distribution valve body, a main inlet connected with a high-pressure air source, a left outlet connected with the left air chamber and a right outlet connected with the right air chamber are formed in the air distribution valve cavity, the main inlet is located in the middle of the air distribution valve cavity along the axial direction, the left outlet and the right outlet are located on the same side and are arranged opposite to the main inlet, and the left outlet and the right outlet are symmetrically arranged along the axial direction of the main inlet.

3. The flexible pneumatic driving method of a diaphragm pump according to claim 2, wherein the air distribution valve cavity is provided with an air distribution valve core which forms a sealed sliding guide fit with the air distribution valve cavity, the air distribution valve core comprises a left core body, a right core body and a mandrel which is coaxially and fixedly connected with the left core body and the right core body, the diameter of the mandrel is smaller than that of the left core body, the left core body is used for plugging the left outlet, the right core body is used for plugging the right outlet, the maximum distance between the left core body and the left end of the air distribution valve cavity is equal to the distance between the left outlet and the left end of the air distribution valve cavity, and the maximum distance between the right core body and the right end of the air distribution valve cavity is equal to.

4. A flexible pneumatic driving method of a diaphragm pump according to claim 3, wherein a first check valve is disposed between said left outlet and said left air chamber, and a first check valve is disposed between said right outlet and said right air chamber.

5. A flexible pneumatic driving method for a diaphragm pump according to claim 4, wherein the first check valve comprises a check valve body having a hollow cylindrical inner cavity therein, an input conduit for connecting the input end of the check valve body and the left/right outlet, an output conduit for connecting the output end of the check valve body and the left/right end cap, an annular step coaxially fixed in the inner cavity of the check valve body near the output end thereof, a sealing cylinder coaxially arranged in the inner cavity of the check valve body and forming a sliding guide fit therewith, the sealing cylinder being open near the output end of the check valve body and closed near the input end of the check valve body, a sealing spring arranged in the sealing cylinder, one end of the sealing spring abutting against the closed end of the sealing cylinder, the other end abutting against the annular step, and the elastic force of the sealing spring always directed from the annular step to the sealing cylinder The sealing device comprises a closed end, an annular butt joint groove is coaxially formed in an inner cavity of the one-way valve body and is located between the annular step and an input end of the one-way valve body, a butt joint hole communicated with the inside of the sealing barrel is formed in the outer circular surface of the sealing barrel and is close to the closed end of the sealing barrel, the butt joint hole is provided with a plurality of butt joint holes, the butt joint holes are arranged in an array mode along the circumferential direction of the sealing barrel, and the distance between the butt joint holes and the butt joint groove is equal to the distance between the sealing.

6. A flexible pneumatic driving method of a diaphragm pump according to claim 1, wherein said exhaust valve comprises two exhaust valve bodies and a common exhaust valve core, the two exhaust valve bodies are arranged symmetrically left and right and are arranged corresponding to the left end cap and the right end cap one by one, the exhaust valve body on the left side is used for exhausting the compressed gas in the left air chamber, the exhaust valve body on the right side is used for exhausting the compressed gas in the right air chamber, and the exhaust valve core is used for controlling the on-off of the inside of the exhaust valve core.

7. The flexible pneumatic driving method of a diaphragm pump according to claim 6, wherein the exhaust valve further comprises a fixed plate fixedly mounted on the mounting frame and located on the other side of the cylinder block, and an exhaust valve body is fixedly mounted on the fixed plate, the exhaust valve body is provided with a cylindrical inner cavity with openings at left and right ends, the axial direction of the inner cavity is parallel to the axial direction of the reciprocating rod, one end of the exhaust valve body away from the fixed plate is provided with an exhaust inlet communicated with the inner cavity thereof, one end of the exhaust valve body close to the fixed plate is provided with an exhaust outlet communicated with the inner cavity thereof, the exhaust outlet is communicated with the outside, the exhaust inlet and the exhaust outlet are arranged opposite, a first docking conduit is arranged between the exhaust inlet and the first one-way valve on the same side, the input end of the first docking conduit is communicated with the inner cavity of the first one-way valve, the communication position is, the exhaust valve core is arranged into a rod-shaped structure which is axially parallel to the axial direction of the reciprocating rod, the exhaust valve core is movably inserted in the inner cavity of the exhaust valve body along the axial end position of the exhaust valve core and forms sealed sliding guide fit with the inner cavity, and the outer circular surface of the exhaust valve core along the axial end position of the exhaust valve core is provided with a butt flat groove which is used for connecting and communicating the exhaust inlet and the exhaust outlet in an initial state.

8. The flexible pneumatic driving method of a diaphragm pump according to claim 7, wherein the exhaust valve core is coaxially and fixedly sleeved with an external boss along an axial middle position of the exhaust valve core, the external portion of the exhaust valve core is movably sleeved with two return springs, the two return springs are respectively located on one side of the external boss, one end of each return spring abuts against the external boss, the other end of each return spring abuts against the exhaust valve body, the elastic force of each return spring always points to the external boss through the exhaust valve body, and the elastic forces of the two return springs are balanced in an initial state and the external boss is located between the two exhaust valve bodies.

9. A flexible pneumatic driving method of a diaphragm pump according to claim 8, wherein a rectangular connecting plate having a length direction parallel to the axial direction of the reciprocating rod is fixedly disposed on one side of the external boss close to the cylinder, the connecting plate is fixedly connected to the external boss at a middle position along the length direction, a trigger plate extending toward the cylinder is disposed at one end of the connecting plate along the length direction, the distance between the two trigger plates is smaller than the distance of the left and right movement of the driving piston, a linkage frame is fixedly disposed at an end position of the reciprocating rod, a trigger protrusion is fixedly disposed on the linkage frame, and the trigger protrusion is disposed at a middle position between the two trigger plates in the initial state.

10. A method of flexible pneumatic actuation of a diaphragm pump according to claim 1, wherein said alternate air distribution mechanism is provided in two, wherein one alternative air distribution mechanism is arranged between the first butt joint guide pipe on the left side and the right end of the air distribution valve cavity, the other alternative matching mechanism is arranged between the first butt joint guide pipe on the right side and the left end of the air distribution valve cavity, the alternative air distribution mechanism comprises a second one-way valve, a second butt joint guide pipe and an exhaust pipe provided with a plurality of exhaust holes, the output end of the second one-way valve is communicated with the left end/right end of the exhaust valve cavity, the input end of the second butt-joint guide pipe is connected and communicated with the butt-joint guide pipe, the output end of the second butt-joint guide pipe is connected and communicated with the input end of the second one-way valve, the structure, the size and the shape of the second one-way valve are completely consistent with those of the first one-way valve, the input end of the outer discharge pipe is connected and communicated with the inner cavity of the second one-way valve, and the connection position is located between the annular step in the second one-way valve and the sealing cylinder in the initial state.